<HTML>
<BODY BGCOLOR="white">
<PRE>
<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.configuration.event;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import java.util.ArrayList;<a name="line.19"></a>
<FONT color="green">020</FONT>    import java.util.Collection;<a name="line.20"></a>
<FONT color="green">021</FONT>    import java.util.Collections;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.util.Iterator;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.util.concurrent.CopyOnWriteArrayList;<a name="line.23"></a>
<FONT color="green">024</FONT>    <a name="line.24"></a>
<FONT color="green">025</FONT>    /**<a name="line.25"></a>
<FONT color="green">026</FONT>     * &lt;p&gt;<a name="line.26"></a>
<FONT color="green">027</FONT>     * A base class for objects that can generate configuration events.<a name="line.27"></a>
<FONT color="green">028</FONT>     * &lt;/p&gt;<a name="line.28"></a>
<FONT color="green">029</FONT>     * &lt;p&gt;<a name="line.29"></a>
<FONT color="green">030</FONT>     * This class implements functionality for managing a set of event listeners<a name="line.30"></a>
<FONT color="green">031</FONT>     * that can be notified when an event occurs. It can be extended by<a name="line.31"></a>
<FONT color="green">032</FONT>     * configuration classes that support the event mechanism. In this case these<a name="line.32"></a>
<FONT color="green">033</FONT>     * classes only need to call the {@code fireEvent()} method when an event<a name="line.33"></a>
<FONT color="green">034</FONT>     * is to be delivered to the registered listeners.<a name="line.34"></a>
<FONT color="green">035</FONT>     * &lt;/p&gt;<a name="line.35"></a>
<FONT color="green">036</FONT>     * &lt;p&gt;<a name="line.36"></a>
<FONT color="green">037</FONT>     * Adding and removing event listeners can happen concurrently to manipulations<a name="line.37"></a>
<FONT color="green">038</FONT>     * on a configuration that cause events. The operations are synchronized.<a name="line.38"></a>
<FONT color="green">039</FONT>     * &lt;/p&gt;<a name="line.39"></a>
<FONT color="green">040</FONT>     * &lt;p&gt;<a name="line.40"></a>
<FONT color="green">041</FONT>     * With the {@code detailEvents} property the number of detail events can<a name="line.41"></a>
<FONT color="green">042</FONT>     * be controlled. Some methods in configuration classes are implemented in a way<a name="line.42"></a>
<FONT color="green">043</FONT>     * that they call other methods that can generate their own events. One example<a name="line.43"></a>
<FONT color="green">044</FONT>     * is the {@code setProperty()} method that can be implemented as a<a name="line.44"></a>
<FONT color="green">045</FONT>     * combination of {@code clearProperty()} and {@code addProperty()}.<a name="line.45"></a>
<FONT color="green">046</FONT>     * With {@code detailEvents} set to &lt;b&gt;true&lt;/b&gt;, all involved methods<a name="line.46"></a>
<FONT color="green">047</FONT>     * will generate events (i.e. listeners will receive property set events,<a name="line.47"></a>
<FONT color="green">048</FONT>     * property clear events, and property add events). If this mode is turned off<a name="line.48"></a>
<FONT color="green">049</FONT>     * (which is the default), detail events are suppressed, so only property set<a name="line.49"></a>
<FONT color="green">050</FONT>     * events will be received. Note that the number of received detail events may<a name="line.50"></a>
<FONT color="green">051</FONT>     * differ for different configuration implementations.<a name="line.51"></a>
<FONT color="green">052</FONT>     * {@link org.apache.commons.configuration.HierarchicalConfiguration HierarchicalConfiguration}<a name="line.52"></a>
<FONT color="green">053</FONT>     * for instance has a custom implementation of {@code setProperty()},<a name="line.53"></a>
<FONT color="green">054</FONT>     * which does not generate any detail events.<a name="line.54"></a>
<FONT color="green">055</FONT>     * &lt;/p&gt;<a name="line.55"></a>
<FONT color="green">056</FONT>     * &lt;p&gt;<a name="line.56"></a>
<FONT color="green">057</FONT>     * In addition to &amp;quot;normal&amp;quot; events, error events are supported. Such<a name="line.57"></a>
<FONT color="green">058</FONT>     * events signal an internal problem that occurred during access of properties.<a name="line.58"></a>
<FONT color="green">059</FONT>     * For them a special listener interface exists:<a name="line.59"></a>
<FONT color="green">060</FONT>     * {@link ConfigurationErrorListener}. There is another set of<a name="line.60"></a>
<FONT color="green">061</FONT>     * methods dealing with event listeners of this type. The<a name="line.61"></a>
<FONT color="green">062</FONT>     * {@code fireError()} method can be used by derived classes to send<a name="line.62"></a>
<FONT color="green">063</FONT>     * notifications about errors to registered observers.<a name="line.63"></a>
<FONT color="green">064</FONT>     * &lt;/p&gt;<a name="line.64"></a>
<FONT color="green">065</FONT>     *<a name="line.65"></a>
<FONT color="green">066</FONT>     * @author &lt;a href="http://commons.apache.org/configuration/team-list.html"&gt;Commons Configuration team&lt;/a&gt;<a name="line.66"></a>
<FONT color="green">067</FONT>     * @version $Id: EventSource.java 1234617 2012-01-22 21:31:01Z oheger $<a name="line.67"></a>
<FONT color="green">068</FONT>     * @since 1.3<a name="line.68"></a>
<FONT color="green">069</FONT>     */<a name="line.69"></a>
<FONT color="green">070</FONT>    public class EventSource<a name="line.70"></a>
<FONT color="green">071</FONT>    {<a name="line.71"></a>
<FONT color="green">072</FONT>        /** A collection for the registered event listeners. */<a name="line.72"></a>
<FONT color="green">073</FONT>        private Collection&lt;ConfigurationListener&gt; listeners;<a name="line.73"></a>
<FONT color="green">074</FONT>    <a name="line.74"></a>
<FONT color="green">075</FONT>        /** A collection for the registered error listeners.*/<a name="line.75"></a>
<FONT color="green">076</FONT>        private Collection&lt;ConfigurationErrorListener&gt; errorListeners;<a name="line.76"></a>
<FONT color="green">077</FONT>    <a name="line.77"></a>
<FONT color="green">078</FONT>        /** A lock object for guarding access to the detail events counter. */<a name="line.78"></a>
<FONT color="green">079</FONT>        private final Object lockDetailEventsCount = new Object();<a name="line.79"></a>
<FONT color="green">080</FONT>    <a name="line.80"></a>
<FONT color="green">081</FONT>        /** A counter for the detail events. */<a name="line.81"></a>
<FONT color="green">082</FONT>        private int detailEvents;<a name="line.82"></a>
<FONT color="green">083</FONT>    <a name="line.83"></a>
<FONT color="green">084</FONT>        /**<a name="line.84"></a>
<FONT color="green">085</FONT>         * Creates a new instance of {@code EventSource}.<a name="line.85"></a>
<FONT color="green">086</FONT>         */<a name="line.86"></a>
<FONT color="green">087</FONT>        public EventSource()<a name="line.87"></a>
<FONT color="green">088</FONT>        {<a name="line.88"></a>
<FONT color="green">089</FONT>            initListeners();<a name="line.89"></a>
<FONT color="green">090</FONT>        }<a name="line.90"></a>
<FONT color="green">091</FONT>    <a name="line.91"></a>
<FONT color="green">092</FONT>        /**<a name="line.92"></a>
<FONT color="green">093</FONT>         * Adds a configuration listener to this object.<a name="line.93"></a>
<FONT color="green">094</FONT>         *<a name="line.94"></a>
<FONT color="green">095</FONT>         * @param l the listener to add<a name="line.95"></a>
<FONT color="green">096</FONT>         */<a name="line.96"></a>
<FONT color="green">097</FONT>        public void addConfigurationListener(ConfigurationListener l)<a name="line.97"></a>
<FONT color="green">098</FONT>        {<a name="line.98"></a>
<FONT color="green">099</FONT>            checkListener(l);<a name="line.99"></a>
<FONT color="green">100</FONT>            listeners.add(l);<a name="line.100"></a>
<FONT color="green">101</FONT>        }<a name="line.101"></a>
<FONT color="green">102</FONT>    <a name="line.102"></a>
<FONT color="green">103</FONT>        /**<a name="line.103"></a>
<FONT color="green">104</FONT>         * Removes the specified event listener so that it does not receive any<a name="line.104"></a>
<FONT color="green">105</FONT>         * further events caused by this object.<a name="line.105"></a>
<FONT color="green">106</FONT>         *<a name="line.106"></a>
<FONT color="green">107</FONT>         * @param l the listener to be removed<a name="line.107"></a>
<FONT color="green">108</FONT>         * @return a flag whether the event listener was found<a name="line.108"></a>
<FONT color="green">109</FONT>         */<a name="line.109"></a>
<FONT color="green">110</FONT>        public boolean removeConfigurationListener(ConfigurationListener l)<a name="line.110"></a>
<FONT color="green">111</FONT>        {<a name="line.111"></a>
<FONT color="green">112</FONT>            return listeners.remove(l);<a name="line.112"></a>
<FONT color="green">113</FONT>        }<a name="line.113"></a>
<FONT color="green">114</FONT>    <a name="line.114"></a>
<FONT color="green">115</FONT>        /**<a name="line.115"></a>
<FONT color="green">116</FONT>         * Returns a collection with all configuration event listeners that are<a name="line.116"></a>
<FONT color="green">117</FONT>         * currently registered at this object.<a name="line.117"></a>
<FONT color="green">118</FONT>         *<a name="line.118"></a>
<FONT color="green">119</FONT>         * @return a collection with the registered<a name="line.119"></a>
<FONT color="green">120</FONT>         * {@code ConfigurationListener}s (this collection is a snapshot<a name="line.120"></a>
<FONT color="green">121</FONT>         * of the currently registered listeners; manipulating it has no effect<a name="line.121"></a>
<FONT color="green">122</FONT>         * on this event source object)<a name="line.122"></a>
<FONT color="green">123</FONT>         */<a name="line.123"></a>
<FONT color="green">124</FONT>        public Collection&lt;ConfigurationListener&gt; getConfigurationListeners()<a name="line.124"></a>
<FONT color="green">125</FONT>        {<a name="line.125"></a>
<FONT color="green">126</FONT>            return Collections.unmodifiableCollection(new ArrayList&lt;ConfigurationListener&gt;(listeners));<a name="line.126"></a>
<FONT color="green">127</FONT>        }<a name="line.127"></a>
<FONT color="green">128</FONT>    <a name="line.128"></a>
<FONT color="green">129</FONT>        /**<a name="line.129"></a>
<FONT color="green">130</FONT>         * Removes all registered configuration listeners.<a name="line.130"></a>
<FONT color="green">131</FONT>         */<a name="line.131"></a>
<FONT color="green">132</FONT>        public void clearConfigurationListeners()<a name="line.132"></a>
<FONT color="green">133</FONT>        {<a name="line.133"></a>
<FONT color="green">134</FONT>            listeners.clear();<a name="line.134"></a>
<FONT color="green">135</FONT>        }<a name="line.135"></a>
<FONT color="green">136</FONT>    <a name="line.136"></a>
<FONT color="green">137</FONT>        /**<a name="line.137"></a>
<FONT color="green">138</FONT>         * Returns a flag whether detail events are enabled.<a name="line.138"></a>
<FONT color="green">139</FONT>         *<a name="line.139"></a>
<FONT color="green">140</FONT>         * @return a flag if detail events are generated<a name="line.140"></a>
<FONT color="green">141</FONT>         */<a name="line.141"></a>
<FONT color="green">142</FONT>        public boolean isDetailEvents()<a name="line.142"></a>
<FONT color="green">143</FONT>        {<a name="line.143"></a>
<FONT color="green">144</FONT>            return checkDetailEvents(0);<a name="line.144"></a>
<FONT color="green">145</FONT>        }<a name="line.145"></a>
<FONT color="green">146</FONT>    <a name="line.146"></a>
<FONT color="green">147</FONT>        /**<a name="line.147"></a>
<FONT color="green">148</FONT>         * Determines whether detail events should be generated. If enabled, some<a name="line.148"></a>
<FONT color="green">149</FONT>         * methods can generate multiple update events. Note that this method<a name="line.149"></a>
<FONT color="green">150</FONT>         * records the number of calls, i.e. if for instance<a name="line.150"></a>
<FONT color="green">151</FONT>         * {@code setDetailEvents(false)} was called three times, you will<a name="line.151"></a>
<FONT color="green">152</FONT>         * have to invoke the method as often to enable the details.<a name="line.152"></a>
<FONT color="green">153</FONT>         *<a name="line.153"></a>
<FONT color="green">154</FONT>         * @param enable a flag if detail events should be enabled or disabled<a name="line.154"></a>
<FONT color="green">155</FONT>         */<a name="line.155"></a>
<FONT color="green">156</FONT>        public void setDetailEvents(boolean enable)<a name="line.156"></a>
<FONT color="green">157</FONT>        {<a name="line.157"></a>
<FONT color="green">158</FONT>            synchronized (lockDetailEventsCount)<a name="line.158"></a>
<FONT color="green">159</FONT>            {<a name="line.159"></a>
<FONT color="green">160</FONT>                if (enable)<a name="line.160"></a>
<FONT color="green">161</FONT>                {<a name="line.161"></a>
<FONT color="green">162</FONT>                    detailEvents++;<a name="line.162"></a>
<FONT color="green">163</FONT>                }<a name="line.163"></a>
<FONT color="green">164</FONT>                else<a name="line.164"></a>
<FONT color="green">165</FONT>                {<a name="line.165"></a>
<FONT color="green">166</FONT>                    detailEvents--;<a name="line.166"></a>
<FONT color="green">167</FONT>                }<a name="line.167"></a>
<FONT color="green">168</FONT>            }<a name="line.168"></a>
<FONT color="green">169</FONT>        }<a name="line.169"></a>
<FONT color="green">170</FONT>    <a name="line.170"></a>
<FONT color="green">171</FONT>        /**<a name="line.171"></a>
<FONT color="green">172</FONT>         * Adds a new configuration error listener to this object. This listener<a name="line.172"></a>
<FONT color="green">173</FONT>         * will then be notified about internal problems.<a name="line.173"></a>
<FONT color="green">174</FONT>         *<a name="line.174"></a>
<FONT color="green">175</FONT>         * @param l the listener to register (must not be &lt;b&gt;null&lt;/b&gt;)<a name="line.175"></a>
<FONT color="green">176</FONT>         * @since 1.4<a name="line.176"></a>
<FONT color="green">177</FONT>         */<a name="line.177"></a>
<FONT color="green">178</FONT>        public void addErrorListener(ConfigurationErrorListener l)<a name="line.178"></a>
<FONT color="green">179</FONT>        {<a name="line.179"></a>
<FONT color="green">180</FONT>            checkListener(l);<a name="line.180"></a>
<FONT color="green">181</FONT>            errorListeners.add(l);<a name="line.181"></a>
<FONT color="green">182</FONT>        }<a name="line.182"></a>
<FONT color="green">183</FONT>    <a name="line.183"></a>
<FONT color="green">184</FONT>        /**<a name="line.184"></a>
<FONT color="green">185</FONT>         * Removes the specified error listener so that it does not receive any<a name="line.185"></a>
<FONT color="green">186</FONT>         * further events caused by this object.<a name="line.186"></a>
<FONT color="green">187</FONT>         *<a name="line.187"></a>
<FONT color="green">188</FONT>         * @param l the listener to remove<a name="line.188"></a>
<FONT color="green">189</FONT>         * @return a flag whether the listener could be found and removed<a name="line.189"></a>
<FONT color="green">190</FONT>         * @since 1.4<a name="line.190"></a>
<FONT color="green">191</FONT>         */<a name="line.191"></a>
<FONT color="green">192</FONT>        public boolean removeErrorListener(ConfigurationErrorListener l)<a name="line.192"></a>
<FONT color="green">193</FONT>        {<a name="line.193"></a>
<FONT color="green">194</FONT>            return errorListeners.remove(l);<a name="line.194"></a>
<FONT color="green">195</FONT>        }<a name="line.195"></a>
<FONT color="green">196</FONT>    <a name="line.196"></a>
<FONT color="green">197</FONT>        /**<a name="line.197"></a>
<FONT color="green">198</FONT>         * Removes all registered error listeners.<a name="line.198"></a>
<FONT color="green">199</FONT>         *<a name="line.199"></a>
<FONT color="green">200</FONT>         * @since 1.4<a name="line.200"></a>
<FONT color="green">201</FONT>         */<a name="line.201"></a>
<FONT color="green">202</FONT>        public void clearErrorListeners()<a name="line.202"></a>
<FONT color="green">203</FONT>        {<a name="line.203"></a>
<FONT color="green">204</FONT>            errorListeners.clear();<a name="line.204"></a>
<FONT color="green">205</FONT>        }<a name="line.205"></a>
<FONT color="green">206</FONT>    <a name="line.206"></a>
<FONT color="green">207</FONT>        /**<a name="line.207"></a>
<FONT color="green">208</FONT>         * Returns a collection with all configuration error listeners that are<a name="line.208"></a>
<FONT color="green">209</FONT>         * currently registered at this object.<a name="line.209"></a>
<FONT color="green">210</FONT>         *<a name="line.210"></a>
<FONT color="green">211</FONT>         * @return a collection with the registered<a name="line.211"></a>
<FONT color="green">212</FONT>         * {@code ConfigurationErrorListener}s (this collection is a<a name="line.212"></a>
<FONT color="green">213</FONT>         * snapshot of the currently registered listeners; it cannot be manipulated)<a name="line.213"></a>
<FONT color="green">214</FONT>         * @since 1.4<a name="line.214"></a>
<FONT color="green">215</FONT>         */<a name="line.215"></a>
<FONT color="green">216</FONT>        public Collection&lt;ConfigurationErrorListener&gt; getErrorListeners()<a name="line.216"></a>
<FONT color="green">217</FONT>        {<a name="line.217"></a>
<FONT color="green">218</FONT>            return Collections.unmodifiableCollection(new ArrayList&lt;ConfigurationErrorListener&gt;(errorListeners));<a name="line.218"></a>
<FONT color="green">219</FONT>        }<a name="line.219"></a>
<FONT color="green">220</FONT>    <a name="line.220"></a>
<FONT color="green">221</FONT>        /**<a name="line.221"></a>
<FONT color="green">222</FONT>         * Creates an event object and delivers it to all registered event<a name="line.222"></a>
<FONT color="green">223</FONT>         * listeners. The method will check first if sending an event is allowed<a name="line.223"></a>
<FONT color="green">224</FONT>         * (making use of the {@code detailEvents} property), and if<a name="line.224"></a>
<FONT color="green">225</FONT>         * listeners are registered.<a name="line.225"></a>
<FONT color="green">226</FONT>         *<a name="line.226"></a>
<FONT color="green">227</FONT>         * @param type the event's type<a name="line.227"></a>
<FONT color="green">228</FONT>         * @param propName the name of the affected property (can be &lt;b&gt;null&lt;/b&gt;)<a name="line.228"></a>
<FONT color="green">229</FONT>         * @param propValue the value of the affected property (can be &lt;b&gt;null&lt;/b&gt;)<a name="line.229"></a>
<FONT color="green">230</FONT>         * @param before the before update flag<a name="line.230"></a>
<FONT color="green">231</FONT>         */<a name="line.231"></a>
<FONT color="green">232</FONT>        protected void fireEvent(int type, String propName, Object propValue, boolean before)<a name="line.232"></a>
<FONT color="green">233</FONT>        {<a name="line.233"></a>
<FONT color="green">234</FONT>            if (checkDetailEvents(-1))<a name="line.234"></a>
<FONT color="green">235</FONT>            {<a name="line.235"></a>
<FONT color="green">236</FONT>                Iterator&lt;ConfigurationListener&gt; it = listeners.iterator();<a name="line.236"></a>
<FONT color="green">237</FONT>                if (it.hasNext())<a name="line.237"></a>
<FONT color="green">238</FONT>                {<a name="line.238"></a>
<FONT color="green">239</FONT>                    ConfigurationEvent event =<a name="line.239"></a>
<FONT color="green">240</FONT>                            createEvent(type, propName, propValue, before);<a name="line.240"></a>
<FONT color="green">241</FONT>                    while (it.hasNext())<a name="line.241"></a>
<FONT color="green">242</FONT>                    {<a name="line.242"></a>
<FONT color="green">243</FONT>                        it.next().configurationChanged(event);<a name="line.243"></a>
<FONT color="green">244</FONT>                    }<a name="line.244"></a>
<FONT color="green">245</FONT>                }<a name="line.245"></a>
<FONT color="green">246</FONT>            }<a name="line.246"></a>
<FONT color="green">247</FONT>        }<a name="line.247"></a>
<FONT color="green">248</FONT>    <a name="line.248"></a>
<FONT color="green">249</FONT>        /**<a name="line.249"></a>
<FONT color="green">250</FONT>         * Creates a {@code ConfigurationEvent} object based on the passed in<a name="line.250"></a>
<FONT color="green">251</FONT>         * parameters. This is called by {@code fireEvent()} if it decides<a name="line.251"></a>
<FONT color="green">252</FONT>         * that an event needs to be generated.<a name="line.252"></a>
<FONT color="green">253</FONT>         *<a name="line.253"></a>
<FONT color="green">254</FONT>         * @param type the event's type<a name="line.254"></a>
<FONT color="green">255</FONT>         * @param propName the name of the affected property (can be &lt;b&gt;null&lt;/b&gt;)<a name="line.255"></a>
<FONT color="green">256</FONT>         * @param propValue the value of the affected property (can be &lt;b&gt;null&lt;/b&gt;)<a name="line.256"></a>
<FONT color="green">257</FONT>         * @param before the before update flag<a name="line.257"></a>
<FONT color="green">258</FONT>         * @return the newly created event object<a name="line.258"></a>
<FONT color="green">259</FONT>         */<a name="line.259"></a>
<FONT color="green">260</FONT>        protected ConfigurationEvent createEvent(int type, String propName, Object propValue, boolean before)<a name="line.260"></a>
<FONT color="green">261</FONT>        {<a name="line.261"></a>
<FONT color="green">262</FONT>            return new ConfigurationEvent(this, type, propName, propValue, before);<a name="line.262"></a>
<FONT color="green">263</FONT>        }<a name="line.263"></a>
<FONT color="green">264</FONT>    <a name="line.264"></a>
<FONT color="green">265</FONT>        /**<a name="line.265"></a>
<FONT color="green">266</FONT>         * Creates an error event object and delivers it to all registered error<a name="line.266"></a>
<FONT color="green">267</FONT>         * listeners.<a name="line.267"></a>
<FONT color="green">268</FONT>         *<a name="line.268"></a>
<FONT color="green">269</FONT>         * @param type the event's type<a name="line.269"></a>
<FONT color="green">270</FONT>         * @param propName the name of the affected property (can be &lt;b&gt;null&lt;/b&gt;)<a name="line.270"></a>
<FONT color="green">271</FONT>         * @param propValue the value of the affected property (can be &lt;b&gt;null&lt;/b&gt;)<a name="line.271"></a>
<FONT color="green">272</FONT>         * @param ex the {@code Throwable} object that caused this error event<a name="line.272"></a>
<FONT color="green">273</FONT>         * @since 1.4<a name="line.273"></a>
<FONT color="green">274</FONT>         */<a name="line.274"></a>
<FONT color="green">275</FONT>        protected void fireError(int type, String propName, Object propValue, Throwable ex)<a name="line.275"></a>
<FONT color="green">276</FONT>        {<a name="line.276"></a>
<FONT color="green">277</FONT>            Iterator&lt;ConfigurationErrorListener&gt; it = errorListeners.iterator();<a name="line.277"></a>
<FONT color="green">278</FONT>            if (it.hasNext())<a name="line.278"></a>
<FONT color="green">279</FONT>            {<a name="line.279"></a>
<FONT color="green">280</FONT>                ConfigurationErrorEvent event =<a name="line.280"></a>
<FONT color="green">281</FONT>                        createErrorEvent(type, propName, propValue, ex);<a name="line.281"></a>
<FONT color="green">282</FONT>                while (it.hasNext())<a name="line.282"></a>
<FONT color="green">283</FONT>                {<a name="line.283"></a>
<FONT color="green">284</FONT>                    it.next().configurationError(event);<a name="line.284"></a>
<FONT color="green">285</FONT>                }<a name="line.285"></a>
<FONT color="green">286</FONT>            }<a name="line.286"></a>
<FONT color="green">287</FONT>        }<a name="line.287"></a>
<FONT color="green">288</FONT>    <a name="line.288"></a>
<FONT color="green">289</FONT>        /**<a name="line.289"></a>
<FONT color="green">290</FONT>         * Creates a {@code ConfigurationErrorEvent} object based on the<a name="line.290"></a>
<FONT color="green">291</FONT>         * passed in parameters. This is called by {@code fireError()} if it<a name="line.291"></a>
<FONT color="green">292</FONT>         * decides that an event needs to be generated.<a name="line.292"></a>
<FONT color="green">293</FONT>         *<a name="line.293"></a>
<FONT color="green">294</FONT>         * @param type the event's type<a name="line.294"></a>
<FONT color="green">295</FONT>         * @param propName the name of the affected property (can be &lt;b&gt;null&lt;/b&gt;)<a name="line.295"></a>
<FONT color="green">296</FONT>         * @param propValue the value of the affected property (can be &lt;b&gt;null&lt;/b&gt;)<a name="line.296"></a>
<FONT color="green">297</FONT>         * @param ex the {@code Throwable} object that caused this error<a name="line.297"></a>
<FONT color="green">298</FONT>         * event<a name="line.298"></a>
<FONT color="green">299</FONT>         * @return the event object<a name="line.299"></a>
<FONT color="green">300</FONT>         * @since 1.4<a name="line.300"></a>
<FONT color="green">301</FONT>         */<a name="line.301"></a>
<FONT color="green">302</FONT>        protected ConfigurationErrorEvent createErrorEvent(int type, String propName, Object propValue, Throwable ex)<a name="line.302"></a>
<FONT color="green">303</FONT>        {<a name="line.303"></a>
<FONT color="green">304</FONT>            return new ConfigurationErrorEvent(this, type, propName, propValue, ex);<a name="line.304"></a>
<FONT color="green">305</FONT>        }<a name="line.305"></a>
<FONT color="green">306</FONT>    <a name="line.306"></a>
<FONT color="green">307</FONT>        /**<a name="line.307"></a>
<FONT color="green">308</FONT>         * Overrides the {@code clone()} method to correctly handle so far<a name="line.308"></a>
<FONT color="green">309</FONT>         * registered event listeners. This implementation ensures that the clone<a name="line.309"></a>
<FONT color="green">310</FONT>         * will have empty event listener lists, i.e. the listeners registered at an<a name="line.310"></a>
<FONT color="green">311</FONT>         * {@code EventSource} object will not be copied.<a name="line.311"></a>
<FONT color="green">312</FONT>         *<a name="line.312"></a>
<FONT color="green">313</FONT>         * @return the cloned object<a name="line.313"></a>
<FONT color="green">314</FONT>         * @throws CloneNotSupportedException if cloning is not allowed<a name="line.314"></a>
<FONT color="green">315</FONT>         * @since 1.4<a name="line.315"></a>
<FONT color="green">316</FONT>         */<a name="line.316"></a>
<FONT color="green">317</FONT>        @Override<a name="line.317"></a>
<FONT color="green">318</FONT>        protected Object clone() throws CloneNotSupportedException<a name="line.318"></a>
<FONT color="green">319</FONT>        {<a name="line.319"></a>
<FONT color="green">320</FONT>            EventSource copy = (EventSource) super.clone();<a name="line.320"></a>
<FONT color="green">321</FONT>            copy.initListeners();<a name="line.321"></a>
<FONT color="green">322</FONT>            return copy;<a name="line.322"></a>
<FONT color="green">323</FONT>        }<a name="line.323"></a>
<FONT color="green">324</FONT>    <a name="line.324"></a>
<FONT color="green">325</FONT>        /**<a name="line.325"></a>
<FONT color="green">326</FONT>         * Checks whether the specified event listener is not &lt;b&gt;null&lt;/b&gt;. If this<a name="line.326"></a>
<FONT color="green">327</FONT>         * is the case, an {@code IllegalArgumentException} exception is thrown.<a name="line.327"></a>
<FONT color="green">328</FONT>         *<a name="line.328"></a>
<FONT color="green">329</FONT>         * @param l the listener to be checked<a name="line.329"></a>
<FONT color="green">330</FONT>         * @throws IllegalArgumentException if the listener is &lt;b&gt;null&lt;/b&gt;<a name="line.330"></a>
<FONT color="green">331</FONT>         */<a name="line.331"></a>
<FONT color="green">332</FONT>        private static void checkListener(Object l)<a name="line.332"></a>
<FONT color="green">333</FONT>        {<a name="line.333"></a>
<FONT color="green">334</FONT>            if (l == null)<a name="line.334"></a>
<FONT color="green">335</FONT>            {<a name="line.335"></a>
<FONT color="green">336</FONT>                throw new IllegalArgumentException("Listener must not be null!");<a name="line.336"></a>
<FONT color="green">337</FONT>            }<a name="line.337"></a>
<FONT color="green">338</FONT>        }<a name="line.338"></a>
<FONT color="green">339</FONT>    <a name="line.339"></a>
<FONT color="green">340</FONT>        /**<a name="line.340"></a>
<FONT color="green">341</FONT>         * Initializes the collections for storing registered event listeners.<a name="line.341"></a>
<FONT color="green">342</FONT>         */<a name="line.342"></a>
<FONT color="green">343</FONT>        private void initListeners()<a name="line.343"></a>
<FONT color="green">344</FONT>        {<a name="line.344"></a>
<FONT color="green">345</FONT>            listeners = new CopyOnWriteArrayList&lt;ConfigurationListener&gt;();<a name="line.345"></a>
<FONT color="green">346</FONT>            errorListeners = new CopyOnWriteArrayList&lt;ConfigurationErrorListener&gt;();<a name="line.346"></a>
<FONT color="green">347</FONT>        }<a name="line.347"></a>
<FONT color="green">348</FONT>    <a name="line.348"></a>
<FONT color="green">349</FONT>        /**<a name="line.349"></a>
<FONT color="green">350</FONT>         * Helper method for checking the current counter for detail events. This<a name="line.350"></a>
<FONT color="green">351</FONT>         * method checks whether the counter is greater than the passed in limit.<a name="line.351"></a>
<FONT color="green">352</FONT>         *<a name="line.352"></a>
<FONT color="green">353</FONT>         * @param limit the limit to be compared to<a name="line.353"></a>
<FONT color="green">354</FONT>         * @return &lt;b&gt;true&lt;/b&gt; if the counter is greater than the limit,<a name="line.354"></a>
<FONT color="green">355</FONT>         *         &lt;b&gt;false&lt;/b&gt; otherwise<a name="line.355"></a>
<FONT color="green">356</FONT>         */<a name="line.356"></a>
<FONT color="green">357</FONT>        private boolean checkDetailEvents(int limit)<a name="line.357"></a>
<FONT color="green">358</FONT>        {<a name="line.358"></a>
<FONT color="green">359</FONT>            synchronized (lockDetailEventsCount)<a name="line.359"></a>
<FONT color="green">360</FONT>            {<a name="line.360"></a>
<FONT color="green">361</FONT>                return detailEvents &gt; limit;<a name="line.361"></a>
<FONT color="green">362</FONT>            }<a name="line.362"></a>
<FONT color="green">363</FONT>        }<a name="line.363"></a>
<FONT color="green">364</FONT>    }<a name="line.364"></a>




























































</PRE>
</BODY>
</HTML>
